Fauna
Fungus

Caesar's Mushroom

Amanita basii

Also known as Mexican Caesar's Mushroom, Broad-Spored Caesar's Mushroom, Hongo César

Mexican Caesar's mushrooms emerge from a thick white universal veil, unveiling a bright orange to reddish cap with distinctly striate margins and vibrant yellow gills. They form crucial mycorrhizal partnerships with pine and oak trees in cool highland forests across Mexico and Central America. The smooth yellow stalk features a delicate hanging ring and remains anchored inside a prominent white cup at its base.

FungusMycorrhizalHighland
Caesar's Mushroom reference1 / 7
(c) Alan Rockefeller, some rights reserved (CC BY), uploaded by Alan Rockefeller · cc-by
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Not EvaluatedConservation statusIUCN Red List categoriesLCNTVUENCREWEXNot Evaluated — not placed on the risk ladderRed List categories, explained →
Key facts
Diet & preyMycorrhizal (symbiotic with oak and pine roots)
Predators
  • Fungus gnats
  • Slugs
  • Squirrels
ThreatsDeforestation, climate shift, and intense forest clearing
HabitatsHighland pine-oak forests and humid montane woodlands
Life spanUnderground mycelium lives for decades; fruiting bodies persist 5–10 days
Classification
  1. FamilyAmanitaceae
  2. SpeciesAmanita basii
Range & activity
Range data is not available yet.
Safe observation
Interaction riskHigh
  1. Low
  2. Moderate
  3. High
  4. Very high
Why interaction risk is high
Many wild mushrooms have deadly toxic look-alikes; never eat wild fungi based on app identification alone.
Responsible observation
  • Observation: Examine the base of the stem gently to observe the white egg-like volva without breaking it.
  • Timing: Look for fruiting bodies during late summer and early autumn after heavy highland rainstorms.
  • Habitat cues: Search near mature oak and pine roots in undisturbed mountainous soils.
Related species
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